Discount Coupon Code during checkout, for online food order system

This project is a follow-up work of our previous project: https://www.freelancer.com/projects/PHP-MySQL/Add-Edit-toppings-pizza-product.html Now the new tasks for new project are as follows. _________________________________________________________ * Configure products in admin to define total number of free toppings and apply the free cost at the shop * Adding 6 Portions of toppings in admin and configuring them to have default prices set at admin/restaurant. * Add a simple coupon code discount calculation in checkout To create the coupon discount: -there will be a coupon_discount table -table will contain fields: coupon_code no_use (how many times this coupon-code can be used: 1,2,3... unlimited) no_used (how many times coupon_code has been used) percent (YES/NO, if yes discount applied as percent else fixed amount) min_amount (Minimum total amount when discount can be applied) currency (if discount is an amount, then what currency) log_in (YES/NO, if yes then customer must login to apply the discount) restaurant_id (if the coupon code is bind to a restaurant, then what is the restaurant_id) The coupon code will look like "some_characters-some_number-some_characters". The some_number is the "discount amount OR discount percent". Example: abc-05.50-xyz. In this coupon code the discount amount will be 5.5(converted currency) OR 5.5% of products TOTAL (we do not give discount from service charges like home delivery fee) During checkout (in [login to view URL]) file we will add a text field to feed coupon code and a button to Apply discount and calculate TOTAL after coupon discount. The system has a BONUS system where a registered customer is given bonus points. Now if the customer is using a coupon code, the bonus points should turn to zero. When a login is necessary, we need to make available login and registration facilities available. For these, we just link the system login/registration in checkout.php. These links will be opened in a new window. Once the customer has successfully registered and/or logged in, the window will be closed automatically and [login to view URL] file window will be reloaded filled with logged in user detail. * in Checkout, when we choose COD(Cash On Delivery) payment method the checkout window is closed and redirected to the home page but when we chose Online Bank payment method the we are being redirected to home page inside the checkout window without being closed the checkout window. In Online Bank payment the checkout window needs to be closed after we return from the payment process. Also the redirections should be as follows: - (When payment method is COD) OR (when payment method is Online Bank payment and payment has been created successfully) AND customer is logged in, he will be redirected to the newly created order information in his account. - But (if the customer is not logged + (payment method is COD) OR (payment method is Online bank and paid successfully) then he will be redirected to [login to view URL]